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Got a bunch of 5850s. Best way to OC them?

post #1 of 10
Thread Starter 
I've come across 4 ATI 5850s very cheaply. They are all Visiontek reference designs. Would it be better to flash them to Asus EAH5850 bios or Asus 5870 bios? And if so, what kind of clocks can I expect from the stock cooler?

Will 1.3 volts fry the cards?

Im very new to card overclocking
post #2 of 10
I've never pushed mine over 1.25V, and with those voltages I managed core: 950MHz and memory: 1200MHz. But I've heard of others on this forum getting better core clocks with less voltage. I've also heard that 1000MHz core and 1200MHz memory is the sweet spot for this series, so that might be something you want to shoot for .

Good luck!
 
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post #3 of 10
FOUR!? O_O Wow... Happy overclocking!
     
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post #4 of 10
Thread Starter 
Quote:
Originally Posted by onoz View Post
I've never pushed mine over 1.25V, and with those voltages I managed core: 950MHz and memory: 1200MHz. But I've heard of others on this forum getting better core clocks with less voltage. I've also heard that 1000MHz core and 1200MHz memory is the sweet spot for this series, so that might be something you want to shoot for .

Good luck!
So would I be better off with an unlocked 5850 bios or a 5870? On the one hand, I can probably go all out. On the other hand, i will have a safe OC at 5870 levels.
post #5 of 10
you don't need to alter the bios on those cards. just use MSI afterburner and you can unlock voltage through that.

My visiontek did 1030/1200 and was good for 5035 on 3dmark11.
post #6 of 10
Quote:
Originally Posted by Weedvender View Post
So would I be better off with an unlocked 5850 bios or a 5870? On the one hand, I can probably go all out. On the other hand, i will have a safe OC at 5870 levels.
I don't think flashing 5870 BIOS would do anything, since from there, you'd be able to just continue to OC as you would have a done with a normal 5850. Flashing them with 5870 BIOS wouldn't get them 5870 performance, since they have a different number of SPUs. Also, after hearing of the possibility of "bricking" your card, I tend to shy away from flashing BIOS onto a GPU. You could lose it!

I think OC'ing them would be your best bet, but... I mean seriously you have 4, do you even need to OC? Hahaha.
 
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post #7 of 10
I have the EAH5850 and i cant control the voltage its at like 793v right noww O_o
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post #8 of 10
Thread Starter 
Quote:
Originally Posted by Smoblikat View Post
I have the EAH5850 and i cant control the voltage its at like 793v right noww O_o
Theres a registry mod for I think MSI afterburner that allows you to play with the voltages. There is another mod that stops checking if ur card is an MSI or not.
post #9 of 10
4?! Time to start looking at BOINC MSI Afterburner would be a good place to start, even if they all don't clock like champs, any overclock is better then no overclock.
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post #10 of 10
Flashing to Asus 5870 Bios is a good call, actually, as long as you're sure the card is reference.

This will raise both clocks, and the voltage, to stock 5870 levels ... without having to run AB or other software. Since it's Asus, it will unlock the OC's in the CCC. It does not, of course, unlock any shaders.

Bottom-line, I am a big fan of using the Asus 5870 bios on reference 5850's ... and since you obviously have a backup card, may as well try it ... my bet is you'll dig it
    
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